(C) In the human skeletal system,there are $12$ pairs of ribs,which makes a total of $24$ ribs.These ribs are classified into three types: true ribs (

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(C) In the human skeletal system,there are $12$ pairs of ribs,which makes a total of $24$ ribs.These ribs are classified into three types: true ribs ($1-7$ pairs),false ribs ($8-10$ pairs),and floating ribs ($11-12$ pairs).Therefore,the total number of ribs is $12 \times 2 = 24$.